errorless

The jewel itself was not so precious as the rays of enduring light which form it, and flash from it, beneath that errorless hand.

But it is usually desirable to impose some condition which itself will fix the errorless parallels.

In the above description it has been assumed that the two errorless parallels have been selected.

Remember, I have no hope of finding a solution in an errorless human being.

We will 'ostensibly work at the task of developing an errorless man', is the way I believe you put it.